docs: def add_html_report_optgroup(parser):
      """
      Option group for the HTML report format
      """
  
      g = parser.add_argument_group("HTML Report Options")
  
      g.add_argument("--html-stylesheet", action="append",
                     dest="html_stylesheets", default=list())
  
      g.add_argument("--html-javascript", action="append",
                     dest="html_javascripts", default=list())
  
      g.add_argument("--html-copy-data", action="store", default=None,
                     help="Copy default resources to the given directory and"
                     " enable them in the template")